GB 21456-2024Minimum allowable values of the energy efficiency and energy efficiency grades for household and similar kitchen appliances (English PDF)

1 Scope

GB 21456-2024 is the Chinese national standard on minimum allowable values of the energy efficiency and energy efficiency grades for household and similar kitchen appliances, in the field of energy and heat transfer engineering. It carries no /T suffix, which in the Chinese system means compliance is mandatory: a product or a practice within its scope has to meet it to be lawfully made, sold or carried out in China. It was issued on 23 August 2024 by the State Administration for Market Regulation; Standardization Administration of China, and has been in force since 1 September 2025. Classification: ICS 27.010, CCS F01. This page is published from the official record of the standard held by the Chinese standards administration: the identification, the dates, the classification and the issuing body are taken from there. The clause text, the tables and the numeric limits are in the document itself, which is delivered complete in English translation.

This document specifies the energy efficiency grades and heating efficiency calculation, technical requirements and test methods for household and similar kitchen appliances. This document applies to the following types of household and similar kitchen appliances with a rated voltage not exceeding 250V AC.

a) Electric rice cookers with a rated power not exceeding 2200 W and heated by electric heating elements or electromagnetic induction;

b) Electric pressure cookers with the ability to automatically control working pressure, heated by electric heating elements or electromagnetic induction, with a rated power not exceeding 2200 W, a rated volume not exceeding 10L, and a rated cooking pressure of 40 kPa~140 kPa (gauge pressure);

c) Electric stew pots and electric stew cookers with a rated power not exceeding 2200 W;

d) Electric kettles that can pour water from the spout by holding the handle and tilting the kettle body, are only used to boil water and heat water to boiling point, and do not have an automatic water filling function;

e) Induction cooktops with one or more heating units, each with a rated power of 700 W~3500 W;

f) Microwave ovens with a maximum rated input power of 2500 W or less, which use electromagnetic energy in the ISM band of 2450 MHz and resistive heating elements to heat items and food in the oven cavity, including combination microwave ovens. NOTE. The ISM band is an electromagnetic frequency range determined by the International Telecommunication Union (ITU) and adopted in the standard numbered CISPR11 developed by the International Special Committee on Radio Interference (CISPR). This document does not apply to the following types of kitchen appliances. - Commercial electromagnetic cookers, industrial frequency electromagnetic cookers and concave cookers; - Commercial microwaves, industrial microwaves and microwaves with cooker hoods.

2 Normative references

The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

GB/T 4706.1, Safety of household and similar electrical appliances - Part 1. General requirements

GB/T 4706.14, Safety of household and similar electrical appliances - Part 14. Particular requirements for grills, toasters and similar portable cooking appliances

GB/T 4706.19, Safety of household and similar electrical appliances - Part 19. Particular requirements for appliances for heating liquids

GB/T 4706.21, Safety of household and similar electrical appliances - Part 21. Particular requirements for microwave ovens, including combination microwave ovens

GB 4706.29, Household and similar electrical appliances - Safety - Particular requirements for portable electromagnetic cooker

GB/T 18800-2017, Household microwave oven - Methods for measuring performance

GB/T 22089, Performance requirements and measuring methods for electric kettles

GB/T 35758, Household electrical appliances - Measurement of standby power QB/T 4408, Electric saucepans and similar appliances

3 Terms and definitions

For the purposes of this document, the terms and definitions defined in GB 4706.1, GB 4706.14, GB 4706.19, GB 4706.21, GB 4706.29, GB/T 18800-2017, GB/T 22089, GB/T 35758 and QB/T 4408 as well as the followings apply.

3.1 heating efficiency The ratio of effective energy output to input energy of kitchen appliances.

3.2 standby mode (s) Any mode of the kitchen appliance that provides one or more of the following user- oriented functions or protection functions, and is continuous, when the kitchen appliance is connected to the mains power supply.

a) Other modes (including active mode start or stop) can be triggered by triggering remote switches (including remote control), internal sensors, and timers;

b) Continuous functions. information or status display including clock;

c) Continuous functionality. sensor-based functionality. NOTE. A timer is a clock function (with or without a display) that can perform a periodic, predetermined task (such as switching on and off) and can work continuously. [Source: GB/T 35758-2017, 3.6]

3.3 off mode (s) Any mode of the kitchen appliance that is continuous when the power supply unit of the kitchen appliance is connected to the mains and no standby mode, network mode or active mode is present. Indicators that only alert the user that the product is in the off position are included in the category of off mode. [Source: GB/T 35758-2017, 3.5]

5 Technical requirements

5.1 Minimum allowable values of energy efficiency for electric rice cookers The minimum allowable values of energy efficiency for electric rice cookers are the requirements of energy efficiency grade 3 in Table 1.

5.2 Minimum allowable values of energy efficiency for electric pressure cookers The minimum allowable values of energy efficiency for electric pressure cookers are the requirements of energy efficiency grade 3 in Table 2.

5.3 Minimum allowable values of energy efficiency for electric stew pots and electric stew cookers The minimum allowable values of energy efficiency for electric stew pots and electric stew cookers are the requirements of energy efficiency grade 3 in Table 3.

5.4 Minimum allowable values of energy efficiency for electric kettles The minimum allowable values of energy efficiency for electric kettles are the requirements of energy efficiency grade 3 in Table 4.

5.5 Minimum allowable values of energy efficiency for electromagnetic cookers The minimum allowable values of energy efficiency for electromagnetic cookers are the requirements of energy efficiency grade 3 in Table

5.All heating units of electromagnetic cookers shall meet the corresponding requirements.

6 Test methods

6.1 Test methods for electric rice cookers The test conditions and methods for the heating efficiency, standby power and warm- keeping energy consumption of electric rice cookers shall be in accordance with Annex A.

6.2 Test methods for electric pressure cookers The test conditions and methods for the heating efficiency, standby power and warm- keeping energy consumption of electric pressure cookers shall be in accordance with Annex B.

6.3 Test methods for electric stew pots and electric stew cookers The test conditions and methods for heating efficiency, standby power and warm- keeping energy consumption of electric stew pots and electric stew cookers shall be in accordance with Annex C.

6.4 Test methods for electric kettles The test conditions and methods for the heating efficiency and standby power of electric kettles shall be in accordance with Annex D.

7 Implementation of the standard

For kitchen appliances produced or imported before the implementation date of this document, implementation will begin from the 13th month after the implementation date of this document.

Annex A

(normative) Test method for energy efficiency of electric rice cookers A.1 Test conditions A.1.1 Test environment Unless otherwise specified, the test shall be carried out indoors in accordance with the following environmental requirements.

a) Ambient temperature. 23°C±2°C, wind speed < 0.5m/s, no obvious influence of heating radiation;

b) Relative humidity. 45%~75%;

c) Atmospheric pressure. 98 kPa~106 kPa. A.1.2 Power supply It shall be carried out under the conditions of rated voltage 220 V±

Annex B

(normative) Test method for energy efficiency of electric pressure cookers B.1 Test conditions B.1.1 Test environment Unless otherwise specified, the test shall be conducted indoors in accordance with the following environmental requirements.

a) Ambient temperature. 23°C±2°C; wind speed <

0.5 m/s; no obvious influence of heating radiation;

b) Relative humidity. 45%~75%;

c) Atmospheric pressure. 98 kPa~106 kPa. B.1.2 Power supply The rated voltage shall be 220 V±

2.2 V. The rated frequency shall be

1 Hz. B.1.3 Test measuring instruments and meters Test instruments and meters shall meet the following requirements.

a) The accuracy of voltmeter, power meter and electric energy meter shall not be less than ±0.5%;

b) The resolution of the instrument used to measure temperature is 0.1°C. The accuracy of the temperature measuring instrument shall not be less than ±0.5%;

c) The timer resolution is

0.01 s. The accuracy is ±2 s/h;

d) When the scale is at full capacity, the relative error shall not exceed ±0.1% and the minimum display (scale) value shall be 1 g;

e) Thermocouples shall use thin-wire thermocouples with a wire diameter not exceeding

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